A novel efficient algorithm for music transposition

  • Authors:

  • Bob Lawlor;A. D. Fagan

  • Affiliations:

  • School of Control Systems and Electrical Engineering, Dublin Institute of Technology, Kevin St, Dublin 8, Ireland. E-mail: Rlawlor@dit.ie;Department of Electronic and Electrical Engineering, University College Dublin, Belfield, Dublin 4, Ireland. E-mail: Afagan@faraday.ucd.ie

  • Venue:
  • Organised Sound
  • Year:
  • 1999

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Abstract

We present a novel efficient algorithm for scaling the frequency content of an audio signal by any desired factor in the range 0.5 (minus one octave) to 2.0 (plus one octave) enabling a recording to be played in any desired key without affecting the tempo. The algorithm uses an adaptive overlap-add (AOLA) technique to realise the desired frequency scaling without affecting the duration. Informal listening tests show output quality equal to that of a conventional overlap-add algorithm used in many commercially available systems, but offering significant computational saving relative to that algorithm. The algorithm can also be used to simultaneously change both the tempo and key of a recording.